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I have a GPS-logger with display and speed-measuring. Got 75 km/h at
two points in the recent winter:
* at Les Crosets in Portes Du Soleil (Swiss/France): under the Les
Mossettes - Lift at the Abricotine - slope. You have to speed up there
to make it to the next lift. Darn blue slopes with hills
* at Åre (Sweden): the Paradisbacken - slope in Duved. Hard and cold
snow.

I only take the thing out at places where I can keep an eye on the
display, it is rather meant to log the places I've taken photos of on
the slopes. Maybe I'll look into the gathered data, if I can calculate
speeds from it.

My understanding is that short term speed measurments are not very accurate on
GPS's.

I have a GPS-logger with display and speed-measuring. Got 75 km/h at
two points in the recent winter:
...
I only take the thing out at places where I can keep an eye on the
display, it is rather meant to log the places I've taken photos of on
the slopes. Maybe I'll look into the gathered data, if I can calculate
speeds from it.

My understanding is that short term speed measurments are not very accurate on
GPS's.

That might depend on how "hot" the GPS fixed its first coordinates and
how many satellites it can see. Tested mine several times in a car -
never differed a lot from the cars speed (which has to be calibrated to
show up to 10% + 4 km/h more but never less than actual speed here in
Germany).

That might depend on how "hot" the GPS fixed its first coordinates and
how many satellites it can see. Tested mine several times in a car -
never differed a lot from the cars speed (which has to be calibrated to
show up to 10% + 4 km/h more but never less than actual speed here in
Germany).

Did you test how well the GPS tracked changes in speed? I'd try traveling at riding speed, like maybe 50-60 kph, and see how well
the GPS tracked changes in speed - get on the gas hard, then brake, see if it catches it.

I'm not real familiar with how these units do with the vertical drop, either. Straight horizontal velocity is a lot easier. Don't
some of them use an altimeter to get the elevation more accurately?